1. Problem troubleshooting: It is not that the sidebar is too narrow, but the width of the column is automatically contracted
When I first read the calendar of this sidebar, I always thought it was very incongruous and looked very ‘stingy’. But my sidebar is actually not narrow, where is the problem?
By studying the principles of the HTML structure, I found the root: WordPress default calendar table is used Adaptive column width (Table-Layout: auto). Because the date in each grid is only a single number such as ‘1, 2, 3’, the browser believes that the grid does not need to be too wide, soDeadly compress the column width to the smallest. As a result, the width occupied by the calendar in the sidebar is not even 2/3, leaving a large area of blank space on the left and right sides.
2. Style tracking: positioning core elements
.wp-block-calendar th, found the default style file of Gutenberg systemThe system default settings are very simple, only .25em extremely small margins. To completely renovate, the regular block panel adjustment has failed, and I decided to go directly to WordPress Background → Design→ Style → Extra CSS globally enforced overrides.
3. Practical rectification: core CSS code (with revision instructions)
I wrote the following CSS, the core purpose is:
- Forced column width equality: use
Table-Layout: FixedAllow 7 days to distribute the sidebar width evenly. - Enlarge the font size and the inner margin: Make the calendar stretch.
- Highlight the days of ‘with articles’: Remove the default underscore, give the theme color, and increase the hover effect.
⚠️ Key additions:
color in text #503aa8 In fact, it is a relatively dark purple blue (indigo blue). If you feel blue, you can change it to the color you need at any time.
The following is the final complete and revised CSS code (just copy and paste directly into the ‘extra CSS’):
/* ==========================================================================
🔥 侧边栏日历放大优化 (包含横撑满修复)
解决：默认日历字体偏小、列宽没撑满侧边栏的问题。
========================================================================== */
/* 1. 放大月份标题 ("2026年 6月") */
.wp-block-calendar caption {
font-size: 1.3em !important;
font-weight: bold !important;
margin-bottom: 12px !important;
text-align: center !important;
}
/* 2. 放大日期格子 (单元格内边距和字体) */
.wp-block-calendar td,
.wp-block-calendar th {
font-size: 17px !important; /* 日期数字放大 */
padding: 12px 8px !important; /* 格子上下左右拉开，变舒展 */
text-align: center !important;
}
/* 3. 保证表格宽度占满侧边栏 (配合强制列宽平分) */
.wp-block-calendar table {
width: 100% !important;
table-layout: fixed !important; /* 👈 关键：强制星期一至星期日 7 列等宽平分，彻底撑满！ */
border-collapse: collapse !important;
}
/* 4. 消除日历外层左右内边距，让表格彻底贴紧侧边栏左右边缘 */
.wp-block-calendar {
padding-left: 0 !important;
padding-right: 0 !important;
}
/* 5. 放大底部导航 ("« 5月") */
.wp-calendar-nav {
margin-top: 15px !important;
font-size: 16px !important;
display: flex !important;
justify-content: space-between !important;
}
.wp-calendar-nav a {
text-decoration: none !important;
color: inherit !important;
}
/* 6. 换成主题自定义颜色、加粗 */
.wp-block-calendar td a {
color: #503aa8 !important; /* 👈 主题紫蓝色，觉得偏蓝可以改为纯黑 #000000 或亮红 #d63638 */
font-weight: 700 !important; /* 👈 加粗字体 */
padding-bottom: 2px !important;
transition: all 0.2s ease !important;
}
/* 7. 当鼠标放上去的时候，颜色变成全黑 */
.wp-block-calendar td a:hover {
color: #000000 !important;
border-bottom-color: #000000 !important;
}4. Display of the final results
After applying the above code, the ‘stingy’ calendar, which was originally shrinking in the middle, was instantly changed, not only the table was flatly covered with the entire sidebar, but also immediately became stretched and generous, and the reading experience was significantly improved.
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